* {
    margin: 0;
    padding: 0;
}
html {
    width: 100%;
    font-family: "Microsoft YaHei",-apple-system-font,"Helvetica Neue",Helvetica,STHeiTi,sans-serif;

}
.header {
    position: fixed;
    z-index: 20;
    left: 0;
    top: 0;
    height: 90px;
    width: 100%;
    background-color: #fff;
    transition: height .3s;
}

.header.fixed {
    height: 50px;
    box-shadow: 0 0 1px 0 rgba(0,0,0,.3),0 0 6px 2px rgba(0,0,0,.15);
}
.wrapper {
    width: 970px;
    margin: 0 auto;
}
.clearfix:after {
    display: table;
    clear: both;
    content: "";
}

.header .logo {
    float: left;
    margin: 0;
    width: 180px;
    margin-top: 21px;
    height: 34px;
    background-image: url(http://s.url.cn/qqun/xiaoqu/buluo/p/js/images/big_logo.a9bf2527b09314270250235300104630.png);
    background-repeat: no-repeat;
    transition: all .3s;
}
a {
    text-decoration: none;
    color: #000;
    background-color: transparent;
}
.header .search-box {
    float: left;
    margin-left: 25px;
    height: 30px;
    margin-top: 24px;
    transition: margin .3s;
}
.header .user-wrapper {
    margin-top: 32px;
}
.header .user-wrapper {
    float: right;
    transition: margin .3s;
}
.header .links {
    margin-top: 32px;
}
.slide-down-container {
    font-size: 12px;
    position: relative;
    z-index: 100;
    float: left;
    margin-right: 20px;
}
.slide-down-container .title {
    position: relative;
    cursor: pointer;
    padding-bottom: 10px;
}
.header .slide-down-container.help-links .slide-down-content {
    left: -32px;
}
.slide-down-container .slide-down-content {
    position: absolute;
    font-size: 12px;
    display: none;
    top: 20px;
    width: 88px;
    padding: 10px 0;
    margin-top: 7px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    background-color: #fff;
    border: 1px solid #dbdadf;
    box-shadow: 0 2px 6px 2px rgba(0,0,0,.17);
}
ul {
    list-style: none;
}
.header .search-box input {
    float: left;
    padding: 0;
    height: 28px;
    line-height: 28px;
    width: 340px;
    border: 1px solid #dfdfdf;
    border-radius: 2px;
    border-right: 0;
    padding-left: 10px;
    font-size: 14px;
}
.header .search-box div.search-btn {
    float: left;
    height: 30px;
    width: 64px;

    background: url() center no-repeat #2786e4;
    cursor: pointer;
}
.header .search-box .hot-words {
    clear: left;
    transition: opacity .3s;
    padding-top: 10px;
    font-size: 12px;
}
.header .search-box .hot-words a {
    margin-right: 18px;
    cursor: pointer;
    color: #868686;
}
.slide-down-container .title .title-span {
    max-width: 100px;
    display: inline-block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.slide-down-container .title span {
    position: relative;
    vertical-align: middle;
}
.slide-down-container .title {
    position: relative;
    cursor: pointer;
    padding-bottom: 10px;
}
.slide-down-container {
    font-size: 12px;
    position: relative;
    z-index: 100;
    float: left;
    margin-right: 20px;
}
body {
    background: #ecebf0 url(http://s.url.cn/qqun/xiaoqu/buluo/p/js/images/bg.019aa429f71b955278687d76ea4c0951.jpg) no-repeat center center fixed;
}
.slide-down-container .title .slide-down-icon {
    display: inline-block;
    margin-left: 5px;
    margin-top: 1px;
    width: 5px;
    height: 5px;
    background: url() center no-repeat;
    vertical-align: middle;
}
.login-wrap {
    font-size: 12px;
    margin-left: 4px;
}
.login-wrap .btn-login {
    display: inline-block;
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    line-height: 18px;
    height: 18px;
}
.header .links {
    margin-top: 32px;
}
.header .links, .header .user-wrapper {
    float: right;
    transition: margin .3s;
}

#wrap {
    width: 100%;
}
.cls {
    width: 70%;
    margin: 100px auto 0px auto;
}
.header.fixed .hot-words {
    opacity: 0;
    -ms-filter: "alpha(Opacity=0)";
    pointer-events: none;
}
.header.fixed .links, .header.fixed .user-wrapper {
    margin-top: 15px;
}
.header.fixed .logo {
    background-image: url(http://s.url.cn/qqun/xiaoqu/buluo/p/js/images/small_logo.e402407a1c2d949e81207e68ff99b556.png);
    width: 165px;
    height: 30px;
    margin-top: 10px;
}
.header.fixed .search-box {
    margin-top: 10px;
}

 .to-top {
    width: 50px;
    height: 50px;
    background-image: url(http://s.url.cn/qqun/xiaoqu/buluo/p/js/images/to_top.6a40e92f2a02f3945477ff9937f5cb20.png);
    background-repeat: no-repeat;
    background-position: 0 0;
    background-size: 50px 50px;
    cursor: pointer;
    display: none;
     position: fixed;
     bottom: 150px;
     left: 86%;
}
